Refill my central heating

[DIYlabGuy]

Hi all,

I've installed two new radiators in my living room/dining room. One of which had no pipework so this has all been connected to the existing pipework. My question when refilling is that my boiler is on my 1st floor and not ground floor. The two rads I've installed are 6ft tall vertical style.

The upstairs radiators are coming off my flow and return first with the downstairs being the last radiators on the pipes. Will this make a difference when refilling? Will I still be bleeding my upstairs rads first or the downstairs rads?
The filling loop is connected to the boiler. This might be a stupid suggestion but should I refill the system from the lowest drain valve using my downstairs supply? Just thinking it would fill from bottom upwards. Then bleed from the bottom radiators followed by the upstairs? I'm probably over thinking this completely but just want to prevent any air pockets, especially in my two 6ft downstairs rads.

Thanks

 

[DIYlabGuy]

Ah also it's a combi boiler

 

[terryplumb]

Fill the system by the filling loop. Bleed downstairs rads first.
Do your vertical rads need the flow and return fitted to specific inlet ports ?
You need to add inhibitor into the system.

 

[DIYlabGuy]

Filling loop, no problem. Yeah the flow opposite corner to the bleed valve which I've done. I'll do the inhibitor too got a bottle at home. Just hoping I don't get any issues! Would you always bleed the downstairs rads first or just because the boiler is upstairs? Thanks for the response

 

[terryplumb]

Water going into the system will find it's way downwards ,thanks to gravity, so lower rads fill first and you bleed air from them first. Doesn't matter where the boiler is.
How did you establish which pipe was the flow ?

 

[DIYlabGuy]

Good to know. I had an old rad that I've replaced on one side. I hope I'm right in thinking the trv would be on the flow? And from there I've followed the pipe back to have a new branch off for the 2nd rad

 

[DIYlabGuy]

I'm hoping i won't get problems with the vertical rads either as neither had diverter valves inside. I've been told some do and some don't and it shouldn't be a problem

 

[terryplumb]

Just because a TRV is fitted on a pipe it doesn't automatically mean it's the flow.
If your instructions for the vertical rads specify the flow must connect to a specific port it would be strange for the rad to not have a baffle ( diverter) ?

 

[DIYlabGuy]

It's just the diagram that shows the direction of the flow in relation to the bleed valve. No other indicators. I guess it doesn't specifically say to do that but I've just followed the diagram